Copper becomes green when exposed to moist air for a long period. This

1.	Copper becomes green when exposed to moist air for a long period. This is due to:
Answer» the FORMATION of a layer of CUPRIC oxide on the surface of copper. the formation of a layer of basic carbonate of copper on the surface of copper. the formation of a lyer of cupric HYDROXIDE on the surface of copper. the formation of basic copper sulphate layer on the surface of the metal. Answer :B

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